7028221331 has 4 divisors (see below), whose sum is σ = 7107190200. Its totient is φ = 6949252464.

The previous prime is 7028221313. The next prime is 7028221363. The reversal of 7028221331 is 1331228207.

7028221331 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7028221331 - 2¹⁴ = 7028204947 is a prime.

It is a super-2 number, since 2×7028221331² = 98791790155046823122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7028221294 and 7028221303.

It is not an unprimeable number, because it can be changed into a prime (7028221381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39484301 + ... + 39484478.

It is an arithmetic number, because the mean of its divisors is an integer number (1776797550).

Almost surely, 2^7028221331 is an apocalyptic number.

7028221331 is a deficient number, since it is larger than the sum of its proper divisors (78968869).

7028221331 is an equidigital number, since it uses as much as digits as its factorization.

7028221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78968868.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 7028221331 is about 83834.4877183609. The cubic root of 7028221331 is about 1915.4984721318.

Adding to 7028221331 its reverse (1331228207), we get a palindrome (8359449538).

The spelling of 7028221331 in words is "seven billion, twenty-eight million, two hundred twenty-one thousand, three hundred thirty-one".